Accession Number:

ADA257582

Title:

Microstructure and Mechanical Properties of High Copper HSLA-100 Steel in 2-inch Plate Form

Descriptive Note:

Master's thesis

Corporate Author:

NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s):

Report Date:

1992-06-01

Pagination or Media Count:

64.0

Abstract:

The microstructure and mechanical properties of highly weldable high copper HSLA-100 steel in two-inch 50 mm plate form were investigated in this work. The mechanical property data showed that the steel in the as-quenched and aged conditions not only met the mechanical property specifications of the Navy for HSLA HY 100 steels but also satisfied the requirements for HY-130 steels. Optical, scanning and transmission electron microscope studies of the as- quenched plate indicated that the microstructure was a mixture of lath martensiteretained austenite and bainitic ferrite, which is typical of these steels. On aging this microstructure developed the tempered structures usually encountered in HSLA steels. This investigation concludes that. Increased copper HSLA steel meets all the mechanical property specifications of Navy HSLA-100 ksi yield strength steel regardless of heat treatment and plate thickness up to 50 mm thickness. High copper HSLA-100 steel in 50 mm plate form can fulfill all the mechanical property requirements of Navy 130 ksi yield strength steel with an appropriate temper. The microstructures formed with various heat treatments are consistent with the HSLA-100 CCT diagram. Increasing copper in HSLA-100 steel also increases the toughness as well as the strength, though the dynamics of this process are not clear. Steel, High Copper HSLA-100 Steel, mechanical property, microstructure.

Subject Categories:

  • Properties of Metals and Alloys
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE